Furnace-door frame.



L. L. KNOX. FURNACE DOOR FRAME. APPLIGATION FILED JAN 10. 1014.

Patented Nov. 24, 1914.

5 SHEETS-SHEET 1.

W 4 (2 16mm, "a D MAM fiWrQMMSQ L. L. KNOX.

FURNACE DOOR FRAME.

APPLICATION FILED JAN. 10. 1014.

Patented Nov. 24, 1914.

6 SHEETS-SHEET 2.

INVENTOR WITNESSES L. L. KNOX.

FURNACE DOOR. FRAME.

AIPLIOATIQN FILED JAN. 10, 1914.

Patented Nov. 24, 1914.

5 SHEETS-SHEET 3.

(has.

. 552 715? LA @MQKMQW&Q

WITNESSES L.L.KNOX. FURNACE DOOR FRAME. APPLICATION I'ILED JAN. 10. 1914.

Patented Nov. 24, 1914.

INVENTOR WITNESSES L. L. KNOX.

FURNACE DOOR FRAME.

APPLICATION FILED JAN. 10. 1914. 1 ,1 1 8,428. v Patented Nov. 24, 1914,

5 SHEETS-SHEET 5.

WITNESSES INVENTOR M w A c-ltvum, 1. 1%. mmfl m mx UNITED sTAtrns PATENT OFFICE.

LUTHER L. KNOX, OF AVALON, PENNSYLVANIA, ASSIGNOR T0 KNOX PRESSED 8c WELDED STEEL COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

FURNACE-DOOR FRAME.

Specification of Letters Patent.

Patented Nov. 24, 11:14.

ing part of this specification, in which-- Figure 1 is a front elevation partly broken away of one form of door frame embodyingmy invention; Figs. 2, 3, and 4 are sections taken, respectively, on the lines ]I-II, III-III and IVIV of Fig. 1; Fig. 5 is a front elevation of a modified form of door frame; Figs. 6 and 7 are sections taken, respectively, on the lines VI-VI and VII-VII of Fig. 5; Fig. 8 is a front elevation partly broken away, showing another form of door frame applied to a furnace; Figs. 9 and 10 are sec tions taken, respectively, on the lines IX IX and X-X of Fig. 8; Fig. 11 is a front elevation partly broken away showing still another form of door frame embodying the invention; Figs. 12, 13 and 14 are sections taken, respectively, on the lines XII-XII, XIII--XIII and XIVXIV of Fig. 11; Fig. 15 is a plan view of the blank which may be used in making the upper or lintel portion of the door frame shown inFig. 1; Fig. 16 is a view partly in front elevation and partly in vertical section showing die mechanism and illustrating the first step of forming the arch in said upper or lintel portion; and Fig. 17 is a vertical section of the die mechanism and showing the second step of forming such arch.

My invention has relation to door frames for furnaces, and more particularly to hollow water-cooled door frames formed from sheet metal.

The object of my invention is to provide a door frame of this character which can be readily constructed from sheet metal; in which the seams are located at such points as to be away from the door opening through the frame, and therefore, not liable to become injured by contact with the charging mechanism-or other tools introduced into the furnace, and also to improve the construction in other respects, as here inafter more fully pointed out.

Referring first to the form of my invention shown in Figs. 1 to 4, inclusive, the numeral 2 designates the upper or lintel portion of the frame, and 3 the depending legs, one at each side of the door opening 4. The portion 2 is united to the upper extensions 3 of the legs 3, by welds formed along the lines aa. This portion 2 is formed by taking a sheet of metal forming the arch 5, at the center portion of the sheet, then bending the sheet upon itself into U- form, as clearly shown in Fig. .3, and then closing the upper end of the hollow body so formed by means of a separate top plate (5, welded to the upper edges of the sheet. The lateral edges of the U-shaped body are welded to the inner free edges of the leg extensions 3. It will be noted that the arch 5 is formed integrally in the metal sheet constituting the portion 2. In Figs. 16 and 17, I have illustrated the manner in which this arch is formed. The initial form of the sheet or blank is substantially that shown at A in Fig. 15. The lateral edges of the sheet are preferably somewhat tapered, so as to narrow the sheets toward both ends to take care of distortion of the metal during the forming operations. The sheet is also laterally recessed at A, at its central portion, in order to compensate for the distortion of the metal in forming the arch and to properly shape the ends of the arch to fit the shoulders 7 of the leg portions of the frame. This sheet is placed in a machine having the vertically movable dies B B, and the lower die is then moved upwardly, as shown in Fig. 16, thereby pressing the central portion of the sheet contained between the dotted lines A -A of Fig. 15 upwardly into arch form. Pres- 9 sure is held on the lower die B, and the ,upper die B is then moved downwardly with suilicient pressure to overcome the pressure on the lower die, carrying the sheet downwardly between the former portions (2 (Fig. 17), thereby bending the sheet into the U-shape, while still retaining the arch in the bottom portion. These operations may distort the sheet somewhat, so that it will require some trimming before welding. It may also be necessary in some instances to further work the blank to remove some of the distortions resulting from the die operations. Each of the leg portions 3, 3 is preferably formed from a single piece of inner wallfi9 e i-which' acts as a guide. for the furnace door. The free edgesot'each leg iorming blank, are welded togetherat the *outer forward corner10,-this weld extend- .ing continuously from-the top to-the bottom of the. door i'irame.

-, of stay-bolts.

extends transversely The upper portion of the inneriwal-l. of the leg thus formed, and which is to be united to the lintelportion 2,:ia'then' cut awa as shown in Fig. 3, so as. to-give ifree e ges to be welded to the edges-of SitlllgPOIiZlOD body may-bastifiened or. braced by means 0t connectors'flhfwhich may b'e-in the term Thetrame maybe provided with anysuitxable connections for circulating water throu h its interior. Tn theform shown in these gures, Thave shown one of the legs as having a verticalpipe 12, em tending-downwardly therein from the upper endv and terminating at a point a short distance from its lower end. This pipehas a branchj13', connected thereto,- and which over the arch 5 and thence downwardly tion ot'the other leg. This branch pipe may be provided with suitable discharge perforatlonsld, above the arch 5, so as to dircharge coolin water directly against-the wall of the arc The numeral 15 designates an ofitake connection, located at one of the upper corners of the frame, and 16 is a suitable blow-out or'clean out plug located at the'zlower portions of the legs: By these connections, a continuous circulation of water may be kept-=up throughout the entire frame. it will be noted that, except at theshoulde'rs 7, there are no welds in the structure adjacent the upper opening. This is an. important-feature of the invention, since when such welds are located. at the upper opening, they may be'imured 'or opened up by contact with the charging apparatus or other tools introduced through the door. into the furnace.

The structure shown in Fig.5 diflersfrom that shown on sheet 1, in that the door opening l is -somewhat higher, the archv at the top of the opening is omitted, and the lintel portion 2 is formed at its lower'edge with a rearward lateral projection 2", which forms a metallic :wall over the door opening. in the furnace wall, in the manner described and claimed in my Patent No. 1,070,487, of Au ust-19,1913;- I

The structure shown in' Figs. .8, 9 and 10 difiers-from'the' structure shown on sheet 1 in. two respects, namely, instead of forming the lintel portion in a single U-shaped sheet, closed 'at the topby .a flat strip or plate, this portion is constructed of two U-shaped blanks 17 and 18, the upper blank being inverted and its free edges being welded to, the upper irce edges of the lower blank along the manner as 2. The sheet metal ,to provide through this bottom tieconnection, thewithin the lower por-' niieaae horizontal transverse weld lines 6+ .The I formed thereingiin substantially the same .secondrespect in which the structure shown n these figures difiers from that first described is in the provision of a hollow trans-- verse connecting or tie member 20, which un tes the lowerfends of the depending legs. This member is preferably formed of a single sheet or striprotmetal, bent to form ahollow rectangular shape, with- .its. edges Welded togetheratc. The iendsof this shape are open the inner legs are cutaway at 21,: and the free ends edges. of the member 20; arewelded to the edges of these cutaway portions. In order for an eficient circulation water supply pipe 12 is. preferably provided with a. bent portion 12 at its lower end, which extends a short one end of this connection. supply pipe 13"; also preferably terminates above the arch 19, and does not extend downwardly with the leg at the opposite side. This bottom connectionor tie is a feature at considerable advantage in practice, since+it frame against spreading or twisting in use.

In the constructionshown in Fi s. 11, 12, 13 and 14:, the structure is forme in three separate pieces, namely, the upper or lintel portion'22, andthe two -legs 23, the upper portion 22 resting on the upper ends of the.

legs. The upper or lintel portion 22 is constructed in substantially the same manner as that first described and shown on sheet -1, except that the arch 2 1- terminates ,at the inner vertical edges. of the legs, and. a flat portion 25 is provided: at -each side of the arch to Each of the legs is preferably formed from a single piece of metal in the same manner as before described. The structure is shown as having two vertical water supply pipes 26, one extending downwardly to a point near the lower end of each leg. The legs areof greater depth thanthe upper or lintel portion, as clearly shown in Fig. 12, and the upper portions of the pipes 26 extend up outside of and in -.front of said lintel portion, with their inner edges substantially in vertical alinement with the vertical doorguiding surfaces'26 of the I legs. In this manner, theupper portions of these pipes are utilized as door guides. The top plate 27 of the lintel may be provided with suitable clips 28, to receive and secure the upper end portions of these pipes. The water discharged at the lower ends of the pipes 26 rises in the legs as it becomes heated and passes out through the pipe connections 29, which lead into the lower portion of the lintel, and are provided with horizontally lower blank-"1 8 has the arch 19 lower portions of the distance into The branch rest upon thejupper end of the legin the form first described. The I effectually holdshthepleg portions of the.-

extending discharge branches 30 ftherein.

- The lintel is provided with the central olftake 31, at itsuppcr end. The water is thus made to circulate first through the legs and then through the upper portion or lintel.

It will be noted that in all the forms of the invention, the structure is made with a minimum number of welds, and that these are located away from the door openings in the manner and for the purpose before described.

It will be obvious that my lnventlon is susceptible of various other modifications and that many changes may be made in the details thereof, without departing from the spirit and scope of the appended claims.

I claim:

1. A furnace door frame having an upper or lintel portion, comprising a sheet metal member bent into U-shape' in vertical section, and a closure united to the free edges of said member; substantially as described.

2. A furnace door frame having an upper or lintel portion, comprising a sheet metal member'bent into U-shape in vertical section, said member having a transverse arch formed integrally in the closed U-bend of its lower portion; substantially as described.

3. A hollow, sheet metal, water-cooled door frame, comprising a lintel portion and depending leg portions, the lintel portion being united to the leg portions by vertical welds and the leg portions formed from sheet metal blanks having their edges welded at points remote from the edges of the door opening between the legs, substantially as described.

4. A hollow, sheet metal, water-cooled door frame, comprising a lintel portion and depending leg portions, the lintel port on being united to the leg portions by vertical welds and the leg portions formed from sheet metal blanks having their edges united by welds located at the outer forward corner portions thereof, substantially as described.

5. A hollow, water-cooled sheet metal door frame, comprising an upper lintel portion, depending leg portions, and a hollow tie or connecting member uniting the lower ends of the leg portions, said portions all having communicating water spaces and connections for effecting a water circulation therethrough, said lintel portion, depending leg portions, and connecting memher being formed from a sheet metal blank and having their adjacent edges integrally connected to form a unitary sheet metal structure, substantially as described.

6. A hollow, sheet metal, water-cooled door frame, comprising an upper or lintel portion and depending leg portions, and a hollow tie portion connecting the lower ends of the legs, said legs municati'ng'with the interior of the tie portion, said upper or lintel portion, depending leg portions and the hollow tie portion beingeach formedby a shaped sheet metal blank, and the adjacent edges of said portlons being integrally united to form a unitary-sheet metal structure, substantially as described.

7. A hollow, water-cooled sheet metal door frame, comprising an upper or lintel portion formed from two sheets or blanks, each bent into U-shape and united at their free edges, the joint between the two blanks being above the bottom of the lower blank and removed from the door opening of the frame, substantially as described.

8. A hollow, door frame, comprismg an upper or lintel portion formed from two sheets or blanks, each bent into U-shape and united at their free edges, the lower sheet or blank having an arched bottom formed integrally in the U-bend at the bottom thereof, substantially as described.

9. A hollow, sheet metal door frame, comprising an upper or lintel portion and depending leg portions, the lintel portion having a U-shaped lower member, the leg portions being cut away at their inner sides opposite said U-shaped member, and the free edges of the U-member being united to the "free edges of said cut-away portions, substantially as described.

10. A hollow, sheet metal door frame, comprising an upper or lintel portion and depending leg portions, the lintel portion having a U-shaped lower member, the leg portions being cut away at their inner sides opposite said U-shaped member, and the free edges of the U-member being united to the free edges of said cut-away portions, substantially as described.

11. A furnace door frame, comprising an upper or lintel portion and depending leg members, said leg members being of greater horizontal depth than the lintel portion, and water supply pipes extending downwardly into said leg portions, the upper portions of said pipes lying in fr nt of the lintel and forming door guides, substantially as described.

12. A furnace door frame, comprising an upper or lintel portion and depending leg members, said leg members being of greater horizontal depth than the lintel portion, and water supply pipes extending downwardly into said leg members, the upper portions of said pipes lying in front of the lintel and forming door guides, and said leg members having door-guiding surfaces in vertical alinement with the guiding surfaces of said pipes, substantially as described.

having openings com:

water-cooled, sheet metal her whose body is formed; from & singla my hand. pieca of sheet metal bent upon itself and having its edges welded to each other at 13. in a, fumme door frame, a. leg mem- In testimony hemgofil have hemunto aewfi I LUTHER L. KNOX.

5 an outer corner thereof, and end plates se- Witnesses:

cured tqand closmg the ends of 831d. ioady, H. M. Gomvm, substnmmlly as describes @100. H. PARMELEE. 

